The ClassPad has a symbolic algebra system, sometimes called a computer algebra system,
or CAS. An important distinction is a calculator using symbolic algebra can manipulate unde-
clared variables. The factoring example from Question 4 was an illustration. It is usually a good
idea to tap Edit, then Clear All Variables to ensure that the variables do not have a value
stored in memory. The next 2 questions illustrate additional symbolic algebra.
9. If a model for the height of a ball thrown upwards
as a function of time is given by h = -16t
2
+ vt + c,
compute an expression for the time when the ball
hits the ground.
Tap Interactive, Equation, solve.
Enter the equation in the box by pressing k
and tap
0 to view the variables. The negative
sign is to the left of 16 and has scrolled off.
Enter the variable in the second box and tap E,
or press the
E key; then tap OK.
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